The heaviest rains fell to the northwest of the Interstate 95 corridor, along a stretch from western Montgomery County to the northwestern tip of Harford. Most areas west of I-95 received at least half an inch of rain, with more than an inch over a wide swath and 1.5 to 2 inches in isolated areas, according to radar estimates.

The National Weather Service issued flood warnings for urban areas and streams in Howard, Carroll, Baltimore and Montgomery counties at 12:37 p.m. through 3:30 p.m. Flooding closed some roads in Montgomery, according to the warning.

More than 2 inches had fallen in some areas, according to the warning, with another inch possible through the afternoon.

Drivers are encouraged to take caution, as most flooding deaths occur in automobiles. Do not drive through deep or flowing floodwaters.

Radar estimates show the wettest areas, receiving at least 1.5 inches, including the Glenwood area of western Howard County, in Baltimore County along the Butler Road corridor from Reisterstown to Sparks and east of Interstate 83 near Parkton and White Hall.